Pump



Feb. l, 1944. w. GERHARD Erm.

Filed Nov. 30, `1940 5 Sheets-Sheet 1 PUMP Filed NOV. 30, 1940 W.GERRARD ETALl lf/a FAG-2.

Feb. 1, 1944.v

llllllllI Febl, 1944 w. GERRARD Erm. 2,340,525

. PUMP I Filed Nov. 50, 1940 5 Sheets-Sheet 3 Feb. l, l944.

w. GERRARD ETAL PUMP Filed Nov fao. 1940 5 sheets-sheet 4 Fb. l, 1944.w. G ERRARD yx-:TAL

PUMP

Filed Nov. 30, 1940 5 Sheets-Sheet 5 SIM M14-...Wa

Patented Feb. 1, 1944 PUMP William Gerrard, Timperley, and WalterHarris, Altrincham, England, assignors to Linotype and MachineryLimited, London, England, a limited-liability company of Great BritainApplication November s0, 1940, serial No. 367,902 In Great BritainNovember 30, 1939 18 Claims.

This invention relates to improvements in reciprocating pumps and isparticularly, but not exclusively, adapted to metal pumps such as areemployed in stereotype plate casting machines. Such metal pumps areusually provided with a `spout or throat pipe communicating with a moldor other receptacle up which the molten metal which is to be cast into astereotype plate passes under the operation of the plunger. A bypassvalve is generally provided through which the molten metal is admittedto the pump cylinder.

The present invention provides a reciprocating pump adapted to dischargeliquid to a mold or other receptacle having a bypass valve in the pumpcylinder and mechanism for opening the said valve when the mold orreceptacle is full or when a predetermined quantity of liquid has beendelivered to permit the escape of excess liquid. i

The said mechanism may be actuated by the means for reciprocating thepump plunger and preferably the said plunger is reciprocated by means ofa pump lever which is provided with a stop thereon the said stop beingadjustable to enable the valve to be opened at the appropriate momentand adapted to engage a member which controls the opening of the bypassvalve. -The pump lever may be manually operated or, in the alternative,power operated means may be provided for actuating the same. In theconstruction where it is designed for manual operation, a manual controlis advantageously provided for closing the valve. Where, however, thelever is operated by power means, the arrange'- ment is vpreferably suchthat the said power means are set in motion by the same control thatcloses the valve. p

In vorder that the invention may be more clearly understood the samewill now be described ,inv detail with reference to the accompanyingdrawings which illustrate the same as applied to a pump for molten metaladapted for lling molds for casting stereotype printing plates.

In these drawings- Figure 1- is a side view in section of an embodimentof the invention wherein the pump ismanually operated.

Figure 2 is an end view of Figure l in the drection of the arrow A. Y

Figure 3 is a side view in section of a further `embodiment of theinvention wherein the pum is operated 'by mechanical means.

, Figure 4 is a view ofFigure 3 in the direction of` the arrow 13, withparts broken away.

Figure 5 is a plan view of the construction of Figures 3 and 4.

Referring first to Figures 1 and 2, the pump cylinder I is verticallydisposed within a vmelting pot 2 which contains the molten metal 3 usedfor casting the plates and a spout 4 leads from the cylinder I to themold in which the stereotype plate is cast. The pump plunger 5 isconnected to' a pump plunger rod 6 Whichextends vertically through ahole l in the cylinder and is connected at a point 8 at or near itsupper end to a pump lever 9 which is pivotally mounted in a bearing lIlllocated in the main framework of the' machine. A stop II is mounted onone side of the said pump lever 9 in a bracket I2 thereon and isadjustable lengthwise `of the said bracket by means of a screw I3 or byother suitable means. The said stop Il is adapted to engage the upperend of a valve adjusting rod I4 at a certain desired point on itsdownward travel Vand to yforce the same downwards in a verticaldirection when the pump lever 9 is moved about its pivot I0 so as toraise the pumpplunger 5 in the cylinder I and deliver metal up the spout4 into the casting mold.` The valve adjusting rod I4 is mounted in asuitable bracket I5. The lower end of the valve adjusting rod I4 isconnected to a lever I6 which extends substantially horizontally and ismounted on a valve operating rod I'I. A second substantially horizontalconnecting lever I8 is attached to the valve operating rod Il, the other,endA of which is pivoted to the upper end of a valve rod I9. The lowerend of the valve rod I9 is attached to a bypass valve 263 of invertedmushroom'type `which seats in the upper part of the pump cylinder l. InFigure 1 the valve is shown in the closed position in full lines and inthe open position in dotted lines. J V

It is to be observed that upon depression of the right hand end of thepump lever 9 the pump plunger 5 is raised, causing molten metal to bepumped up the spout 4 `to `the mold. At Vthe 'same time the stop II onYthe pump lever Swengages the top of the valve adjustingrod I4 at theappropriate moment and depresses theV same, causing the valve operatingrod `I'lto vberotated Aand the valve rod I9 to be depressed through theoperation of the connecting lever I8 above referred to. The valve Zilgisthus opened at a moment `which dependscon the adjustmentof the positionVof the stop-II on the pumplever the pump plunger 5 enables any excess ofmolten liquid to escape from the pump cylinder Il to the melting pot.The closing of the valve 210 is effected at the appropriate time byrotation of the valve operating rod I'l by means of a handle 2|.

The machine may, as described, be manually operated by actuation of thepump lever but power operated means may be provided for thisv purposeand the same may be advantageously employed in the case of largermachines where a substantial weight of metal requires to be raised. Suchan arrangement is shown in Figures 3, 4 and 5. In these drawings thedriving power is provided by an electric motor 22 mounted upon the mainframework of the machine which transmits power to a shaft 23 Vat reducedmovement ofV the extension 34 of the roller arm 33 and the worm wheel 26is set in rotation by the motor 22 causing the pump plunger 5 to be setin motion. At the end of one rotation of the worm wheel 2B the roller 32falls into the recess 3l in the disc 3i! and the switch is disconnected.The machine is thereby brought to rest and manual operation of the valveoperating rod handle 2i is required to set the same into opspeed. TheVshaft 23 is conveniently mounted 1 ina bracket 24 and carries a worm 25which is in mesh with a worm wheel 2E whi-ch in turn is mounted on atransverse shaft 2. TheY said worm wheel 25 is provided with aprojecting stud 2,8 which is connected with the pump lever 9 by means ofa link 29 in such a manner that rotation of the worm wheel 26 causesreciprocation of the pump lever 9 and actuates the pump plunger 5.

The worm wheel 2B is provided with a camdisc 3U which is formed at onepoint on its circumference with a recess 3l which is adapted to receivea roller 32 which runs upon the disc 30 and which is mounted on one endof an arm 33 which is loosely pivoted on the valve operating rodV I1.When the Worm wheel disc turns round to a position where the recess 3lis in position to receive the roller 32, the arm 33L is free -to fall sothat the roller 32Vengages in the. recess 3|. extension 34 projectingbeyond the valveV operating rod il the free end of which carries a rod35 Ywhich rod is connected to a switchY tnot shown). This switchcontrols the electric` motor 22, the arrangement being such that whenthe roller 32 falls into the recess 3l the switch breaks theci-rcuitcontrolling the motor 2r and rotation ofthe worm wheel 26ceases. For so long, however, as the roller 32 is upon the higher partof the disc 39 Vthe circuit remains closed andthe electric motor is inoperation so that the pump plunger 5 opera-tes.

The valve operating rod II is mounted in Y bearings and is provided atits free end with a handle 2l by means of which it may bema-nuallyrotated. A coiled tension Spring 3S is provided on this shaft one end ofwhich is held in the shaft bearings and the other end of which engagesthe roller arm 3-3 so as to hold the roller 32 against the disc 30 andto ensure that the same drops into position in the recess 3i inthe said`disc 39 when it is opposite the same. A lpin or stud 31 is provided onthe roller arm 33 which is adapted to engage an arm 3a which 1s nrmlynxedupon thevalve operating rod I1 so that rotationV of the rodil by thelever 2.-! tothe appropriate amount causes the roller arm V3-3to bemoved through an.V arc to such an ex- Y tent that the roller 321 may bewithdrawn from its recess 3l.

The operation of the` arrangement iscontrolled by manual operation oftheV handle 21| of Lthe valve operating -rod Il; Rotation of thisrod'closes the valve 20 and causes the roller 32 Vto bewithdrawn fromthe recess 31|.in the. mannerjius't described. Theswitch which sets theThe said arm 33 is also provided with an Y eration again to effectanother stroke of the pump plunger 5. The valve 2i) is opened at theappropriate time in the same manner as already described with referenceto Figures 1 and 2.

Having described our invention, we declare that what we claim and desireto secure by Letters Patent is:

1. In a reciprocating pump adapted to discharge liquid to a receptacle,the combination of a pump cylinder, a pump plunger therein, a by-passvalve in said cylinder, automatic means for opening said valve afterdelivery of a predetermined quantity of liquid, a pump lever connectedto said pumpv plunger, a worm wheel connected by means of a link to saidpump. plunger, power operated means for driving said worm wheel, a camdisc carried by said worm wheel and having a recess therein, a camroller held in engagement with said cam disc, and means forsimultaneously raising said cam roller from said recess and for settingsaid power operated means in motion.

2. In a reciprocating pump. adapted to discharge liquid to a receptacle,the combination of a pump cylinder, a. p ump plunger therein, aV

by-pass valve in said cylinder, automatic. means for opening said valveafter delivery of a predetermined quantity of liquid, a pump leverconnected to said pump plunger, a worm wheel connected by means of alink to said pump' plunger, power operated means for driving said wormwheel, a cam disc carried by said worm wheel and having a recesstherein, and a carn roller engaging said cam disc, said cam roller beingmounted on an arm which is loosely mounted on a shaft, said roller beingheld in engagement with said cam disc by means of a torsion springengaging saidy arm and the shaft bearing, and said shaft being connectedtothe control for said power operated means.

3. In a reciprocating pump adapted to dis,- charge liquid to a,receptacle, the combination of a pump cylinder, a` pump plunger therein,a Icy-pass valve in said cylinder, automatic means for opening saidvalve after delivery of a. predetermined quantity of liquid, a pumplever connected to said pump plunger, a` worm wheel connected bymeans'of a link'toV said pump plunger, power operated means for drivingsaid `worm wheel;v a cam disc carried' by said worm wheel and having arecess therein, a cam roller engagingsaid cam disc, saidV cam rollerbeing mounted on an arm which is loosely mounted on a shaft, saidYroller being heldY in engagement with said cam disc yby'means of atorsion 4spring engaging said arm and the shaft bearing, said armcarrying a stud, and a second arm fast onl said shaft adapt/edl toengagesaid stud, said shaft being connected to the control for saidpower operated means. Y

4. In a reciprocating Vpump adapted' to discharge liquidto areceptacle,thecombination of a, pump cylinder, a pumpV plunger therein, a by-passvalve in saeidf cylinder, automatic'mean's for opening said valve-afterdeliver-yv of a predetermined quantity of,l liquid', a. pumpleverfconnected to said pump plunger, a worm wheel connected by means ofa link tosaid pump plunger,

power operated means for driving said worm wheel, a cam disc carried bysaid worm wheel and having a recess therein, acam roller engaging saidcam disc, said cam roller being mounted on an arm which is looselymounted on a shaft, said roller being held in engagement with said camdisc by means of a torsion spring engaging said arm and the shaftbearing, said arm carrying a stud, and a second arm fast on said shaftand adapted to engage said stud, said shaft being connected to thecontrol for said power operated means and to said by-pass valve, thearrangement being such that rotation thereof actuates said poweroperated means to set said worm wheel in motion and closes said valve.

5. Inra reciprocating pump adaptedto discharge liquid to a receptacle,the combination of a pump cylinder, a pump plunger therein, a byf-passvalve in said cylinder, a pump lever connected to said pump plunger andhaving an adjustable stop thereon, means engaged by said stop to opensaid by-pass valve after delivery oa predetermined quantity of liquid, aworm wheel connected by means of a link to said pump plunger, poweroperated means for driving said worm wheel, a cam disc carried by saidworm wheel and having a recess therein, a cam roller held in engagementwith said cam disc, and means for simultaneously raising said cam rollerfrom said recess and for setting said power operated means in motion.

6. In a reciprocating pump adapted to discharge liquid to a receptacle,the combination of a pump cylinder, a pump plunger therein, a by-passvalve in said cylinder, a valve operating rod therefor, a pump leverconnected to said plunger and having an adjustable stop thereon, a valveadjusting rod connected by levers to said Valve operating rod, said stopengaging said valve adjusting rod to open said by-pass valve afterdelivery of a predetermined quantityk of liquid, a worm wheel connectedby means of a link to said pump plunger, power -operated means fordriving said worm wheel, a cam disc carried by said worm wheel andhaving a recess therein, a cam roller engaging said cam disc, said camroller being mounted on an arm which is loosely mounted on a shaft, saidroller being held in engagement with said cam disc by means of a torsionspring engaging said arm and the shaft bearing, said arm carrying astud, and a second arm fast on said shaft adapted to engage said stud,said shaft being connectedto the control for `said power operated meansand to said valve operating rod, the arrangement being such thatrotation thereof actuates said power operated means to set said wormwheel in motion and closes said by-pass valve. i

7. In a reciprocating pump adapted to discharge liquid `from a pot to areceptacle,l the combination of a pump cylinder located in the pot, apump plunger therein, an inletfand outlet valve located `adjacent thetop of the` cylinder to insure that the cylinder at each operation ofthe pump plunger is lled to capacity when the pump plunger is at thelower end of its stroke notwithstanding variations in the level of theliquid in the pot and which is closable prior to the inauguration of theactive stroke of the pump plungenand automatic means for opening saidvalve during the delivery stroke of the pump plunger and at somepredetermined period before the completion of said stroke, wherebyapredetermined quantity of liquid will be delivered from the pumpcylinder at each stroke of the pump plunger.

. 8. In a reciprocating pump adapted to discharge liquid from a pot to areceptacle, the combination of a pump cylinder located in the pot, apump plunger therein, an inlet and outlet valve located adjacent the topof the `cylinder to insure that the cylinder at each operation of thepump plunger is filled to capacity when the pump plunger is at the lowerend ofits stroke notwithstanding variations in the level of the liquidin the pot and which is closable prior to the inauguration of the activestroke of the pump plunger, means for vreciprocating said pump plunger,with mechanism whereby said reciprocating means causes said valve toopen during. the delivery stroke of the pump plunger and a-t somepredetermined period before the completion of said stroke, whereby apredetermined quantity of liquid will be delivered from the pumpcylinder at each stroke of Ithe pump plunger.

9. In a reciprocating pump adapted to j discharge liquid from a pct to areceptacle, the combination of a pump cylinder located in the pot, apump plunger therein, an inlet and outlet valve located adjacent the topof the cylinder to insure that the cylinder at each operation of thepump plunger is iilled to capacity When the pump plunger is at the lowerend of its stroke notwithstanding variations in the level of the liquidin the pot and which is closable prior to the inauguration of the activestroke of the pump plunger, anda pump lever connected to said pumpplunger and having an adjustable stop thereon, with means engaged bysaid stop to open said valve during the delivery stroke ofthe pumpplunger and at some predetermined period before the completion of saidstroke, whereby a predetermined quantity of liquid will be deliveredfrom the pump cylinder at each stroke of the pump plunger.

10. In a reciprocating pump adapted to discharge liquid from a pot to areceptacle, the combination of a pump cylinder located in the pot, apump plunger therein, an inlet and outlet valve located adjacent the topof the cylinder to insure that the cylinder at each operation of thepump plunger is lled to capacity when the pump plunger is at the lowerend of its stroke notwithstanding variations in the level of the liquidin the pot and which is closable prior to the inauguration of the activestroke of the pump plunger, a valve operating rod, a pump leverconnected to said pump plunger and having an adjustable Astop Y thereon,and a valve adjusting rod connected by levers to said valve operatingrod, said stop engaging said valve adjusting rod to open said valveduring the delivery stroke of the pump plunger and at some predeterminedperiod before the completion of said stroke, whereby a predeterminedquantity of liquid will be delivered from the pump cylinder at eachstroke of 4the pump plunger.

11. In a reciprocating pump adapted to discharge liquid from a poty to areceptacle, the combination of a pump cylinder located in the pot, apump plunger therein, an inlet and outlet valve located adjacent the topof the cylinder to insure that the cylinder at each operation of thepump plunger is lled to capacity when the pump g `plunger is at thelower end of its stroke notwith- Y valve during the delivery stroke ofthe pump plunger and atv some predetermined period before the completionof said stroke, whereby a predetermined quantity of liquid will bedelivered from the pump cylinder at each stroke of the pump plunger.

l2. In a reciprocating pump adapted to: discharge liquidV from a pot toa receptacle, the combination of a pumpl cylinder located in the pot,.`a pump plunger therein, an inlet andi outlet valve located adjacent thetop ofthe cylinder to insure that the cylinder at each operation lof thepump plunger is filled to capacity when the pu-mp plunger is at thelower end of its stroke notwithstanding variations in the level of theliquid in the pot, a valve'operating rod, a manually operated pump leverconnected to said pump plunger and having an adjustable stop thereon, avalve .adjusting rod connected by levers to said valve operating rod,said stop engaging said adjusting rod to open said valve duringv thedelivery stroke of the pump plunger and at some predetermined periodbefore the completion of said stroke, whereby a predetermined quantityof liquid will be delivered from the pump cylinder at each stroke of thepump plunger, and a manual control on one oi said levers for closingsaid valve.

13.'In a reciprocating pump adapted to discharge liquid from a pot to areceptacle, the combination of a pump cylinder located in the pot, apump plunger therein, an inlet and outlet valve located adjacent the topof the cylinder to Y insure that the cylinder at each operation of thepump plunger is lled to capacity when the pump plunger is at the lowerend' or" its stroke notwithstanding variations in the level of theliquid in .the pot, manual means for closing said valve, power operatedmeans for reciprocating said plunger and mechanism whereby saidreciprocating means causes said valve to open during the delivery strokeof the pump plunger and at some predetermined period before thecompletion of said stroke, whereby a predetermined quantity of liquidwill be delivered from the pump cylinder at each stroke of the pumpplunger.

' 14. In a reciprocating pump adapted toV discharge liquid. from a potto a receptacle, the combination o f a pump cylinder located in the pot,a pump plunger therein, an inlet and outlet valve located adjacent thetop of the cylinder to insure that the cylinder at each operation of thepump plunger is filled to capacity whenthe pump plunger is at the lowerend of its stroke notwithstanding variations in the level of the liquidin the pot, manual means for closing said valve, a

pump lever connected to said pump plunger and havingv an adjustable stopthereon, power operated means for actuating said pump lever, means valvelocated adjacent the top of the cylinder to insure that the cylinder ateach operation of the pump plunger is-lled to capacity when Ythe pumpplunger is at the lower-end of its stroke notwithstanding variations. inthe level oi the liquid. in

the; pot,v power operated means for reciprocating said. plunger,mechanism. whereby said recprocating meanscauses said valve to openduring the delivery stroke of. the pump plunger and at somepredetermined period beforeV the completion of said: stro-ke, whereby apredetermined quantity of liquid will be deliveredl from the pumpcylinder at each stroke of the pump plunger, and a common. manualcontrol. for closing said valve and setting said powerr operated meansin motion.

1'61. In. a reciprocating pumpV adapted to discharge liquid. from a potto a receptacle, the combi-nation of a pump cylinder located in the pot,a pump plunger therein, an inlet and outlet valve located adjacent thetop of the cylinder to insure that the cylinder at each operation of.the pump plunger is lledto capacity when the pump plunger is at thelower end of its stroke notwithstanding. variations in the level of theliquid in the pot, power operated means for reciprocating said plunger,mechanism whereby said reciprocating means. causes said valve to openduring the delivery stroke of the pump plunger and at some predeterminedperiod before the completion of said stroke, whereby a predeterminedquantityV of liquid will be delivered from the pump cylinder at eachstroke of the pump plunger, a common manual control for closing saidvalve and setting said power operated means in motion and automaticmeans for disconnecting said power operated means on completion of anupward and downward stroke of the'pump plunger.' Y

17. In a reciprocating pump adapted to discharge liquid from a pot to areceptacle, the combination of a pump cylinder located in the pot, apump plunger'therein, an inlet and outlet valve located adjacent the topof the cylinder to insure that the cylinder at each operation of thepump plunger is-lled to capacity whenV the pump plunger is4 at the lowerend of its stroke notwithstanding variations in the level of the liquidin the pot, a pump lever connected to said pump plunger having anadjustable stop thereon, means engaged-by said stop to open said valveduring the delivery stroke of the pump plunger' and at somepredetermined period before the completion ot said stroke, whereby apredetermined quantity of liquid will be delivered from the pumpcylinder at each stroke of the pump plunger', power operated means foractuating said pump lever, a common manual control for closing saidvalve and setting said power operated means in motion and automa-ticmeans for disconnecting said power operated means on completion of anupward and downward strokeofV the pump plunger;

18', In a reciprocating pump adapted to discharge liquid from a pot to-a receptacle, the combination of' a pump cylinder located in the pot, apump plunger therein, said cylinder at each operation ofthe pump plungerbeing filled toV capacity when said plunger is at the lower end Vof' itsstroke notwithstanding variations in the level ofv thev liquid in thepot, a by-pass valve in the pum-p cylinder, and automatic means foropening said valve during the delivery stroke of the pump plunger and atSonie predetermined period beto-re the completion oiA saidstroke,whereby a predetermined quantity of liquid will be delivered from thepump cylinder at each stroke of the pump plunger.

WILLIAM GERHARD. WALTER HARRIS..

